They run forever, at least running in Linux on my Box's they do anyway, I just force a Computation Error every so often by Stopping the Process with Process Monitor in Linux. That way the Hr's get counted at WUProp anyway, no Credit so far after a few weeks of running the Project ... It's NCI so what the heck ...
My WUProp Stat's for the Attic Proxy Project: Attic Proxy Project The Attic Proxy 1,262.92 24.53